I would LOVE this capability for another reason: tracking ad clicks. When using AdWords or Overture, you can specify URL parameters for each keyword or ad. It would be very nice to know which ads generate traffic to which pages (e.g. my "contact us" or shopping cart pages).

In a relatively simple implementation, being able to specify what URL parameter to store and what page to store it for would be immensely useful. With a bit more work, making it show paths for a particular URL parameter...now that'd really be nice.